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<!doctype html>
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<title>正则表达式速查 - WebUtils</title>
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<body>
<nav class="breadcrumb">
<a href="../../index.html">首页</a>
<span>›</span>
正则表达式速查
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<div class="container">
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<h1>正则表达式速查</h1>
<p class="desc">常用正则表达式语法速查，点击即可复制</p>
<div class="common-patterns">
<h3>常用正则模式（点击复制）</h3>
<div class="pattern-grid" id="commonPatterns"></div>
</div>
<div class="search-box">
<input type="text" id="search" placeholder="搜索正则语法..." />
</div>
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</div>
<script>
const COMMON_PATTERNS = [
{ name: "邮箱", pattern: "^[\\w.-]+@[\\w.-]+\\.\\w+$" },
{ name: "手机号(中国)", pattern: "^1[3-9]\\d{9}$" },
{ name: "URL", pattern: "^https?://[\\w.-]+(?:/[\\w.-]*)*/?$" },
{
name: "IPv4",
pattern:
"^(?:(?:25[0-5]|2[0-4]\\d|[01]?\\d\\d?)\\.){3}(?:25[0-5]|2[0-4]\\d|[01]?\\d\\d?)$"
},
{
name: "日期(YYYY-MM-DD)",
pattern: "^\\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\\d|3[01])$"
},
{ name: "时间(HH:mm:ss)", pattern: "^(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d$" },
{ name: "十六进制颜色", pattern: "^#?([0-9A-Fa-f]{3}|[0-9A-Fa-f]{6})$" },
{ name: "身份证号", pattern: "^\\d{17}[\\dXx]$" },
{ name: "中文字符", pattern: "[\\u4e00-\\u9fa5]" },
{ name: "密码强度", pattern: "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d).{8,}$" },
{ name: "整数", pattern: "^-?\\d+$" },
{ name: "浮点数", pattern: "^-?\\d+\\.\\d+$" }
];
const REGEX_SYNTAX = {
字符匹配: [
{ syntax: ".", desc: "匹配除换行符外的任意字符", example: "a.c → abc, aXc, a1c" },
{ syntax: "\\d", desc: "匹配数字 [0-9]", example: "\\d\\d → 12, 99" },
{ syntax: "\\D", desc: "匹配非数字", example: "\\D → a, @, 空格" },
{ syntax: "\\w", desc: "匹配单词字符 [a-zA-Z0-9_]", example: "\\w+ → hello, test_1" },
{ syntax: "\\W", desc: "匹配非单词字符", example: "\\W → @, #, 空格" },
{ syntax: "\\s", desc: "匹配空白字符", example: "a\\sb → a b, a\\tb" },
{ syntax: "\\S", desc: "匹配非空白字符", example: "\\S+ → hello" },
{ syntax: "[abc]", desc: "匹配字符集中的任一字符", example: "[aeiou] → 匹配元音" },
{ syntax: "[^abc]", desc: "匹配不在字符集中的字符", example: "[^0-9] → 匹配非数字" },
{ syntax: "[a-z]", desc: "匹配范围内的字符", example: "[a-zA-Z] → 匹配字母" }
],
量词: [
{ syntax: "*", desc: "匹配 0 次或多次", example: "ab*c → ac, abc, abbc" },
{ syntax: "+", desc: "匹配 1 次或多次", example: "ab+c → abc, abbc" },
{ syntax: "?", desc: "匹配 0 次或 1 次", example: "colou?r → color, colour" },
{ syntax: "{n}", desc: "精确匹配 n 次", example: "a{3} → aaa" },
{ syntax: "{n,}", desc: "匹配至少 n 次", example: "a{2,} → aa, aaa, aaaa" },
{ syntax: "{n,m}", desc: "匹配 n 到 m 次", example: "a{2,4} → aa, aaa, aaaa" },
{ syntax: "*?", desc: "非贪婪匹配（最少）", example: "<.*?> → <tag>" },
{ syntax: "+?", desc: "非贪婪匹配 1 次或多次", example: "\\d+? → 匹配单个数字" }
],
锚点: [
{ syntax: "^", desc: "匹配字符串开头", example: "^hello → 开头的hello" },
{ syntax: "$", desc: "匹配字符串结尾", example: "world$ → 结尾的world" },
{ syntax: "\\b", desc: "匹配单词边界", example: "\\bcat\\b → cat（整词）" },
{ syntax: "\\B", desc: "匹配非单词边界", example: "\\Bcat → category中的cat" },
{ syntax: "(?=...)", desc: "正向先行断言", example: "\\d+(?=px) → 100px中的100" },
{ syntax: "(?!...)", desc: "负向先行断言", example: "\\d+(?!px) → 100em中的100" },
{ syntax: "(?<=...)", desc: "正向后行断言", example: "(?<=\\$)\\d+ → $100中的100" },
{ syntax: "(?<!...)", desc: "负向后行断言", example: "(?<!\\$)\\d+ → 非$开头的数字" }
],
分组与引用: [
{ syntax: "(abc)", desc: "捕获分组", example: "(\\d+)-(\\d+) → 捕获两个数字" },
{ syntax: "(?:abc)", desc: "非捕获分组", example: "(?:ab)+ → 不捕获" },
{ syntax: "(?<name>...)", desc: "命名捕获分组", example: "(?<year>\\d{4})" },
{ syntax: "\\1, \\2", desc: "反向引用", example: "(\\w+)\\s\\1 → hello hello" },
{ syntax: "a|b", desc: "或运算", example: "cat|dog → cat 或 dog" }
],
修饰符: [
{ syntax: "i", desc: "忽略大小写", example: "/hello/i → Hello, HELLO" },
{ syntax: "g", desc: "全局匹配", example: "/\\d/g → 匹配所有数字" },
{ syntax: "m", desc: "多行模式", example: "/^hello/m → 每行开头" },
{ syntax: "s", desc: "单行模式（.匹配换行）", example: "/a.b/s → a\\nb" },
{ syntax: "u", desc: "Unicode 模式", example: "/\\u{1F600}/u → 😀" }
],
特殊字符: [
{ syntax: "\\n", desc: "换行符", example: "line1\\nline2" },
{ syntax: "\\r", desc: "回车符", example: "Windows 换行: \\r\\n" },
{ syntax: "\\t", desc: "制表符", example: "col1\\tcol2" },
{ syntax: "\\0", desc: "空字符", example: "字符串结束符" },
{ syntax: "\\\\", desc: "转义反斜杠", example: "C:\\\\Users" },
{ syntax: "\\.", desc: "转义点号", example: "file\\.txt" }
]
};
const categories = Object.keys(REGEX_SYNTAX);
let activeCategory = "全部";
function renderCommonPatterns() {
const container = document.getElementById("commonPatterns");
COMMON_PATTERNS.forEach(function (p) {
const item = document.createElement("div");
item.className = "pattern-item";
item.title = "点击复制";
const name = document.createElement("div");
name.className = "name";
name.textContent = p.name;
item.appendChild(name);
const pattern = document.createElement("div");
pattern.textContent = p.pattern;
item.appendChild(pattern);
item.addEventListener("click", async function () {
try {
await navigator.clipboard.writeText(p.pattern);
item.style.borderColor = "var(--accent-green)";
setTimeout(function () {
item.style.borderColor = "";
}, 500);
} catch (e) {}
});
container.appendChild(item);
});
}
function renderTabs() {
const tabs = document.getElementById("tabs");
tabs.innerHTML = "";
const allTab = document.createElement("button");
allTab.className = "tab" + (activeCategory === "全部" ? " active" : "");
allTab.textContent = "全部";
allTab.addEventListener("click", function () {
setCategory("全部");
});
tabs.appendChild(allTab);
categories.forEach(function (cat) {
const tab = document.createElement("button");
tab.className = "tab" + (activeCategory === cat ? " active" : "");
tab.textContent = cat;
tab.addEventListener("click", function () {
setCategory(cat);
});
tabs.appendChild(tab);
});
}
window.setCategory = function (cat) {
activeCategory = cat;
renderTabs();
renderSyntax();
};
function renderSyntax(filter) {
const content = document.getElementById("content");
content.innerHTML = "";
const search = (filter || "").toLowerCase();
const catsToShow = activeCategory === "全部" ? categories : [activeCategory];
catsToShow.forEach(function (cat) {
const items = REGEX_SYNTAX[cat].filter(function (item) {
if (!search) return true;
return (
item.syntax.toLowerCase().includes(search) ||
item.desc.toLowerCase().includes(search) ||
item.example.toLowerCase().includes(search)
);
});
if (items.length === 0) return;
const title = document.createElement("h2");
title.className = "category-title";
title.textContent = cat;
content.appendChild(title);
items.forEach(function (item) {
const card = document.createElement("div");
card.className = "card";
const header = document.createElement("div");
header.className = "card-header";
const code = document.createElement("code");
code.textContent = item.syntax;
header.appendChild(code);
const copyBtn = document.createElement("button");
copyBtn.className = "copy-btn";
copyBtn.textContent = "📋 复制";
copyBtn.addEventListener("click", async function () {
try {
await navigator.clipboard.writeText(item.syntax);
copyBtn.textContent = "✓ 已复制";
setTimeout(function () {
copyBtn.textContent = "📋 复制";
}, 1000);
} catch (e) {}
});
header.appendChild(copyBtn);
const body = document.createElement("div");
body.className = "card-body";
const desc = document.createElement("div");
desc.className = "desc-text";
desc.textContent = item.desc;
body.appendChild(desc);
const example = document.createElement("div");
example.className = "example";
example.textContent = "示例: " + item.example;
body.appendChild(example);
card.appendChild(header);
card.appendChild(body);
content.appendChild(card);
});
});
}
document.getElementById("search").addEventListener("input", function (e) {
renderSyntax(e.target.value);
});
renderCommonPatterns();
renderTabs();
renderSyntax();
window.toggleTheme = function () {
const html = document.documentElement;
const btn = document.querySelector(".theme-toggle");
const next = html.getAttribute("data-theme") === "dark" ? "" : "dark";
html.setAttribute("data-theme", next);
btn.textContent = next === "dark" ? "🌙" : "☀️";
localStorage.setItem("theme", next || "light");
};
(function () {
const saved = localStorage.getItem("theme");
if (saved === "dark") {
document.documentElement.setAttribute("data-theme", "dark");
const btn = document.querySelector(".theme-toggle");
if (btn) btn.textContent = "🌙";
}
})();
</script>
</body>
</html>